I have a 2004 Renault Megane 15dci it has been a good car from new, but three months ago it startedto have injection lightfault come on and then go off, it always comes on when going round left hand bends and excelerating .
Has been in to the garage to look at this but all they did was to clear the cars computer and said wait and see if it comes on again, which it has, the car is running ok but feels a bit lumpy not as smooth as it did. the garage said it might be the fule pump which would be around £700 to replace!!! Has anyone else had the same problems, or knows what to do to fix this problem.
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it`s the oxygen sensor thats why the car is mix fuel/air in wrong ratio generating unburned fuel in form of black smoke and check lights on you got to change that sensor i hope my answer was helpful and convince sir .
The cheapest way to go is to change the fuel filters first and the air filter. Then I would change the crankshaft sensor.
You may have to bit the bullet , and have the fuel pump changed before the fuel injection pump. The fuel pump in the tank can be loosing pressure to the fuel injectoin pump.
I think the lesser cost is the fuel tank pump vs. the fuel injection pump.
The system runs of fuel and air. No spark like on a gas engine.
So the problem can only be lack of fuel or lack of air getting into the vehicle air induction. A restriction in fuel or air will make the engine run poorly.